腹石随沿子石逐层填平，（）。
A.插紧塞严
B.符合要求
C.排平放稳
D.排紧排平
参考答案：A
单颌多数后牙缺失，若缺牙间隙正常，对颌天然牙排列正常，可选用适合型号的________排列。为了获得与对颌天然牙的良好咬合接触，在排牙过程中，应适当________塑料牙的________。
--- What did your daughter say in her letter?
--- She told me that she ________ Cambridge University already with her friends.
A．had visited
B．have visited
C．was visiting
D．visited
